Thanks for all the replies and advice everyone.
Managed to figure out that it was my fridge which caused the issues. Coincidentally, my fridge started up the exact same time I caused the trips. Now I just make sure I don't open the fridge just before a kettle/oven use and it's great
Weirdly, I have to keep my eskom mains off all the time. I don't really have an issue with this but my inverter hates using the batteries when there's grid power. I've tried all the modes the on-grid and off-grid modes and, even though my battery is fully charged, I end up buying power. Goodwe support and the installer can't figure out why it does this
Does anyone have any ideas why this would happen?